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gitea/routers/private/hook_pre_receive.go
zeripath 8de44d1995
Clean-up HookPreReceive and restore functionality for pushing non-standard refs ()
* Clean-up HookPreReceive and restore functionality for pushing non-standard refs

There was an inadvertent breaking change in  meaning that notes refs and other
git extension refs will be automatically rejected.

Further following  and  the pre-recieve hook code is untenably long and
too complex.

This PR refactors the hook code and removes the incorrect forced rejection of
non-standard refs.

Fix 

Signed-off-by: Andrew Thornton <art27@cantab.net>
2021-09-16 15:34:54 +02:00

472 lines
15 KiB
Go

// Copyright 2019 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
// Package private includes all internal routes. The package name internal is ideal but Golang is not allowed, so we use private as package name instead.
package private
import (
"fmt"
"net/http"
"os"
"strings"
"code.gitea.io/gitea/models"
gitea_context "code.gitea.io/gitea/modules/context"
"code.gitea.io/gitea/modules/git"
"code.gitea.io/gitea/modules/log"
"code.gitea.io/gitea/modules/private"
"code.gitea.io/gitea/modules/web"
pull_service "code.gitea.io/gitea/services/pull"
)
type preReceiveContext struct {
*gitea_context.PrivateContext
user *models.User
perm models.Permission
canCreatePullRequest bool
checkedCanCreatePullRequest bool
canWriteCode bool
checkedCanWriteCode bool
protectedTags []*models.ProtectedTag
gotProtectedTags bool
env []string
opts *private.HookOptions
}
// User gets or loads User
func (ctx *preReceiveContext) User() *models.User {
if ctx.user == nil {
ctx.user, ctx.perm = loadUserAndPermission(ctx.PrivateContext, ctx.opts.UserID)
}
return ctx.user
}
// Perm gets or loads Perm
func (ctx *preReceiveContext) Perm() *models.Permission {
if ctx.user == nil {
ctx.user, ctx.perm = loadUserAndPermission(ctx.PrivateContext, ctx.opts.UserID)
}
return &ctx.perm
}
// CanWriteCode returns true if can write code
func (ctx *preReceiveContext) CanWriteCode() bool {
if !ctx.checkedCanWriteCode {
ctx.canWriteCode = ctx.Perm().CanWrite(models.UnitTypeCode)
ctx.checkedCanWriteCode = true
}
return ctx.canWriteCode
}
// AssertCanWriteCode returns true if can write code
func (ctx *preReceiveContext) AssertCanWriteCode() bool {
if !ctx.CanWriteCode() {
if ctx.Written() {
return false
}
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": "User permission denied.",
})
return false
}
return true
}
// CanCreatePullRequest returns true if can create pull requests
func (ctx *preReceiveContext) CanCreatePullRequest() bool {
if !ctx.checkedCanCreatePullRequest {
ctx.canCreatePullRequest = ctx.Perm().CanRead(models.UnitTypePullRequests)
ctx.checkedCanCreatePullRequest = true
}
return ctx.canCreatePullRequest
}
// AssertCanCreatePullRequest returns true if can create pull requests
func (ctx *preReceiveContext) AssertCreatePullRequest() bool {
if !ctx.CanCreatePullRequest() {
if ctx.Written() {
return false
}
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": "User permission denied.",
})
return false
}
return true
}
// HookPreReceive checks whether a individual commit is acceptable
func HookPreReceive(ctx *gitea_context.PrivateContext) {
opts := web.GetForm(ctx).(*private.HookOptions)
ourCtx := &preReceiveContext{
PrivateContext: ctx,
env: generateGitEnv(opts), // Generate git environment for checking commits
opts: opts,
}
// Iterate across the provided old commit IDs
for i := range opts.OldCommitIDs {
oldCommitID := opts.OldCommitIDs[i]
newCommitID := opts.NewCommitIDs[i]
refFullName := opts.RefFullNames[i]
switch {
case strings.HasPrefix(refFullName, git.BranchPrefix):
preReceiveBranch(ourCtx, oldCommitID, newCommitID, refFullName)
case strings.HasPrefix(refFullName, git.TagPrefix):
preReceiveTag(ourCtx, oldCommitID, newCommitID, refFullName)
case git.SupportProcReceive && strings.HasPrefix(refFullName, git.PullRequestPrefix):
preReceivePullRequest(ourCtx, oldCommitID, newCommitID, refFullName)
default:
ourCtx.AssertCanWriteCode()
}
if ctx.Written() {
return
}
}
ctx.PlainText(http.StatusOK, []byte("ok"))
}
func preReceiveBranch(ctx *preReceiveContext, oldCommitID, newCommitID, refFullName string) {
if !ctx.AssertCanWriteCode() {
return
}
repo := ctx.Repo.Repository
gitRepo := ctx.Repo.GitRepo
branchName := strings.TrimPrefix(refFullName, git.BranchPrefix)
if branchName == repo.DefaultBranch && newCommitID == git.EmptySHA {
log.Warn("Forbidden: Branch: %s is the default branch in %-v and cannot be deleted", branchName, repo)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("branch %s is the default branch and cannot be deleted", branchName),
})
return
}
protectBranch, err := models.GetProtectedBranchBy(repo.ID, branchName)
if err != nil {
log.Error("Unable to get protected branch: %s in %-v Error: %v", branchName, repo, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: err.Error(),
})
return
}
// Allow pushes to non-protected branches
if protectBranch == nil || !protectBranch.IsProtected() {
return
}
// This ref is a protected branch.
//
// First of all we need to enforce absolutely:
//
// 1. Detect and prevent deletion of the branch
if newCommitID == git.EmptySHA {
log.Warn("Forbidden: Branch: %s in %-v is protected from deletion", branchName, repo)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("branch %s is protected from deletion", branchName),
})
return
}
// 2. Disallow force pushes to protected branches
if git.EmptySHA != oldCommitID {
output, err := git.NewCommand("rev-list", "--max-count=1", oldCommitID, "^"+newCommitID).RunInDirWithEnv(repo.RepoPath(), ctx.env)
if err != nil {
log.Error("Unable to detect force push between: %s and %s in %-v Error: %v", oldCommitID, newCommitID, repo, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Fail to detect force push: %v", err),
})
return
} else if len(output) > 0 {
log.Warn("Forbidden: Branch: %s in %-v is protected from force push", branchName, repo)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("branch %s is protected from force push", branchName),
})
return
}
}
// 3. Enforce require signed commits
if protectBranch.RequireSignedCommits {
err := verifyCommits(oldCommitID, newCommitID, gitRepo, ctx.env)
if err != nil {
if !isErrUnverifiedCommit(err) {
log.Error("Unable to check commits from %s to %s in %-v: %v", oldCommitID, newCommitID, repo, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Unable to check commits from %s to %s: %v", oldCommitID, newCommitID, err),
})
return
}
unverifiedCommit := err.(*errUnverifiedCommit).sha
log.Warn("Forbidden: Branch: %s in %-v is protected from unverified commit %s", branchName, repo, unverifiedCommit)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("branch %s is protected from unverified commit %s", branchName, unverifiedCommit),
})
return
}
}
// Now there are several tests which can be overridden:
//
// 4. Check protected file patterns - this is overridable from the UI
changedProtectedfiles := false
protectedFilePath := ""
globs := protectBranch.GetProtectedFilePatterns()
if len(globs) > 0 {
_, err := pull_service.CheckFileProtection(oldCommitID, newCommitID, globs, 1, ctx.env, gitRepo)
if err != nil {
if !models.IsErrFilePathProtected(err) {
log.Error("Unable to check file protection for commits from %s to %s in %-v: %v", oldCommitID, newCommitID, repo, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Unable to check file protection for commits from %s to %s: %v", oldCommitID, newCommitID, err),
})
return
}
changedProtectedfiles = true
protectedFilePath = err.(models.ErrFilePathProtected).Path
}
}
// 5. Check if the doer is allowed to push
canPush := false
if ctx.opts.IsDeployKey {
canPush = !changedProtectedfiles && protectBranch.CanPush && (!protectBranch.EnableWhitelist || protectBranch.WhitelistDeployKeys)
} else {
canPush = !changedProtectedfiles && protectBranch.CanUserPush(ctx.opts.UserID)
}
// 6. If we're not allowed to push directly
if !canPush {
// Is this is a merge from the UI/API?
if ctx.opts.PullRequestID == 0 {
// 6a. If we're not merging from the UI/API then there are two ways we got here:
//
// We are changing a protected file and we're not allowed to do that
if changedProtectedfiles {
log.Warn("Forbidden: Branch: %s in %-v is protected from changing file %s", branchName, repo, protectedFilePath)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("branch %s is protected from changing file %s", branchName, protectedFilePath),
})
return
}
// Allow commits that only touch unprotected files
globs := protectBranch.GetUnprotectedFilePatterns()
if len(globs) > 0 {
unprotectedFilesOnly, err := pull_service.CheckUnprotectedFiles(oldCommitID, newCommitID, globs, ctx.env, gitRepo)
if err != nil {
log.Error("Unable to check file protection for commits from %s to %s in %-v: %v", oldCommitID, newCommitID, repo, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Unable to check file protection for commits from %s to %s: %v", oldCommitID, newCommitID, err),
})
return
}
if unprotectedFilesOnly {
// Commit only touches unprotected files, this is allowed
return
}
}
// Or we're simply not able to push to this protected branch
log.Warn("Forbidden: User %d is not allowed to push to protected branch: %s in %-v", ctx.opts.UserID, branchName, repo)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("Not allowed to push to protected branch %s", branchName),
})
return
}
// 6b. Merge (from UI or API)
// Get the PR, user and permissions for the user in the repository
pr, err := models.GetPullRequestByID(ctx.opts.PullRequestID)
if err != nil {
log.Error("Unable to get PullRequest %d Error: %v", ctx.opts.PullRequestID, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Unable to get PullRequest %d Error: %v", ctx.opts.PullRequestID, err),
})
return
}
// Now check if the user is allowed to merge PRs for this repository
// Note: we can use ctx.perm and ctx.user directly as they will have been loaded above
allowedMerge, err := pull_service.IsUserAllowedToMerge(pr, ctx.perm, ctx.user)
if err != nil {
log.Error("Error calculating if allowed to merge: %v", err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Error calculating if allowed to merge: %v", err),
})
return
}
if !allowedMerge {
log.Warn("Forbidden: User %d is not allowed to push to protected branch: %s in %-v and is not allowed to merge pr #%d", ctx.opts.UserID, branchName, repo, pr.Index)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("Not allowed to push to protected branch %s", branchName),
})
return
}
// If we're an admin for the repository we can ignore status checks, reviews and override protected files
if ctx.perm.IsAdmin() {
return
}
// Now if we're not an admin - we can't overwrite protected files so fail now
if changedProtectedfiles {
log.Warn("Forbidden: Branch: %s in %-v is protected from changing file %s", branchName, repo, protectedFilePath)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("branch %s is protected from changing file %s", branchName, protectedFilePath),
})
return
}
// Check all status checks and reviews are ok
if err := pull_service.CheckPRReadyToMerge(pr, true); err != nil {
if models.IsErrNotAllowedToMerge(err) {
log.Warn("Forbidden: User %d is not allowed push to protected branch %s in %-v and pr #%d is not ready to be merged: %s", ctx.opts.UserID, branchName, repo, pr.Index, err.Error())
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("Not allowed to push to protected branch %s and pr #%d is not ready to be merged: %s", branchName, ctx.opts.PullRequestID, err.Error()),
})
return
}
log.Error("Unable to check if mergable: protected branch %s in %-v and pr #%d. Error: %v", ctx.opts.UserID, branchName, repo, pr.Index, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Unable to get status of pull request %d. Error: %v", ctx.opts.PullRequestID, err),
})
return
}
}
}
func preReceiveTag(ctx *preReceiveContext, oldCommitID, newCommitID, refFullName string) {
if !ctx.AssertCanWriteCode() {
return
}
tagName := strings.TrimPrefix(refFullName, git.TagPrefix)
if !ctx.gotProtectedTags {
var err error
ctx.protectedTags, err = ctx.Repo.Repository.GetProtectedTags()
if err != nil {
log.Error("Unable to get protected tags for %-v Error: %v", ctx.Repo.Repository, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: err.Error(),
})
return
}
ctx.gotProtectedTags = true
}
isAllowed, err := models.IsUserAllowedToControlTag(ctx.protectedTags, tagName, ctx.opts.UserID)
if err != nil {
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: err.Error(),
})
return
}
if !isAllowed {
log.Warn("Forbidden: Tag %s in %-v is protected", tagName, ctx.Repo.Repository)
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("Tag %s is protected", tagName),
})
return
}
}
func preReceivePullRequest(ctx *preReceiveContext, oldCommitID, newCommitID, refFullName string) {
if !ctx.AssertCreatePullRequest() {
return
}
if ctx.Repo.Repository.IsEmpty {
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": "Can't create pull request for an empty repository.",
})
return
}
if ctx.opts.IsWiki {
ctx.JSON(http.StatusForbidden, map[string]interface{}{
"err": "Pull requests are not suppported on the wiki.",
})
return
}
baseBranchName := refFullName[len(git.PullRequestPrefix):]
baseBranchExist := false
if ctx.Repo.GitRepo.IsBranchExist(baseBranchName) {
baseBranchExist = true
}
if !baseBranchExist {
for p, v := range baseBranchName {
if v == '/' && ctx.Repo.GitRepo.IsBranchExist(baseBranchName[:p]) && p != len(baseBranchName)-1 {
baseBranchExist = true
break
}
}
}
if !baseBranchExist {
ctx.JSON(http.StatusForbidden, private.Response{
Err: fmt.Sprintf("Unexpected ref: %s", refFullName),
})
return
}
}
func generateGitEnv(opts *private.HookOptions) (env []string) {
env = os.Environ()
if opts.GitAlternativeObjectDirectories != "" {
env = append(env,
private.GitAlternativeObjectDirectories+"="+opts.GitAlternativeObjectDirectories)
}
if opts.GitObjectDirectory != "" {
env = append(env,
private.GitObjectDirectory+"="+opts.GitObjectDirectory)
}
if opts.GitQuarantinePath != "" {
env = append(env,
private.GitQuarantinePath+"="+opts.GitQuarantinePath)
}
return env
}
func loadUserAndPermission(ctx *gitea_context.PrivateContext, id int64) (user *models.User, perm models.Permission) {
user, err := models.GetUserByID(id)
if err != nil {
log.Error("Unable to get User id %d Error: %v", id, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Unable to get User id %d Error: %v", id, err),
})
return
}
perm, err = models.GetUserRepoPermission(ctx.Repo.Repository, user)
if err != nil {
log.Error("Unable to get Repo permission of repo %s/%s of User %s", ctx.Repo.Repository.OwnerName, ctx.Repo.Repository.Name, user.Name, err)
ctx.JSON(http.StatusInternalServerError, private.Response{
Err: fmt.Sprintf("Unable to get Repo permission of repo %s/%s of User %s: %v", ctx.Repo.Repository.OwnerName, ctx.Repo.Repository.Name, user.Name, err),
})
return
}
return
}